Automatic Liveupdate isn't working

I'm using Norton Security on 3 pc's.  One is XP, one is Vista, one is Win 8.1.  I can manually un liveupdate, but automatic update won't work, even though the box is checked.

Historically, I never used automatic liveupdate because I was on a hughesnet connection.  Now I'm on time-warner, and it won't work.

Support had me delete and reinstall Norton, that did nothing... how would 3 pc's all be corrupted at once?   They suggested reboot, that did nothing

Any ideas?  Is there anything special about a time-warner cable connection that requires some different setting?  everything else works, and I can manually run live-update.